Integral composite nozzle-shield assembly for a gas-cooled...

H - Electricity – 02 – K

Patent

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310/30

H02K 9/08 (2006.01)

Patent

CA 1121428

17GE-2667 INTEGRAL COMPOSITE NOZZLE-SHIELD ASSEMBLY FOR A GAS-COOLED DYNAMOELECTRIC MACHINE Abstract of the Disclosure An integral nozzle-shield assembly for a gas-cooled dynamo- electric machine such as a large turbine-driven generator is described. The nozzle-shield assembly is formed of a non-conductive, non-magnetic material such as molded fiberglass and resin and serves to channel hydrogen gas between a heat exchanger and a rotor-mounted fan used to pump the gas through coolant passages in the dynamoelectric machine, and the assembly also provides a labyrinth seal over the fan blade tips. In one embodiment, the nozzle-shield assembly includes two 180-degree halves whose thickness varies circumferentially and which may be installed in a generator by bolting their outer edges to a stator frame member of the generator and bolting the halves together at the two radial joints between halves using flat metal plate connectors. Use of a material such as fiberglass and resin to form an integral nozzle-shield assembly results in a structure which is not susceptible to eddy current losses or damage due to arcing, and this integral assembly is readily fabricated and easy to install in a dynamoelectric machine.

330904

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